The prompt-echo type (PET) determines the way the initial value is shown and how you can choose a new one. For a position, for instance, you have the choice between cross hairs, a marker, a rubber band etc. The PET can be chosen independently for each input mode.
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The device number via which you wish to enter input for a given mode.
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The identifier of the work station that is to execute the various operations. This is at present the same workstation for each of the input modes.